The 'MAC' in MAC Powersphere by Burrows Golf stands for 'magnitude amplification cavity.' Sounds fancy, and it was - an easier way of describing it might be to say that there was a hole in the sole.īasically, the 'Powersphere' design by Burrows was an early version of what was sometimes called 'inverted cone technology,' among other names: an internal cone - protruding up from sole into the interior of the clubhead - to direct energy back to the clubface.
The MAC Powersphere driver was introduced at the 2003 PGA Merchandise Show by a company called Burrows Golf and drew the endorsement (and investment) of 1981 British Open champion Bill Rogers. By nevets88 in I'm all about that blog 26